The BW4 is an up-to-date microprocessor controlled bench model of high quality and considerable value. It is designed for high frequency switching power coils, multifunctional controller and stable winding Pitch system. It use a special inverter motor and driver as its main winding power, and a precise stepping motor to adjust wire pitch in order to meet the extra requirement of customer's high quality control. The BW4 has graceful appearance and fine configuration, but also simple operation and speedy maintenance etc multifunction. And it has proven to be the optimal choice in BOBBIN winding machines for fine wire applications with 4 spindles.